Feeds

Security by obscurity not so bad after all, argues prof

Game theory suggests secrecy has some uses

Internet Security Threat Report 2014

Security by obscurity may not be so bad after all, according to a provocative new research paper that questions long-held security maxims.

The Kerckhoffs' Principle holds that withholding information on how a system works is no security defence. A second accepted principle is that a defender has to defend against all possible attack vectors, whereas the attacker only needs to find one overlooked flaw to be successful, the so-called fortification principle.

However a new research paper from Prof Dusko Pavlovic of Royal Holloway, University of London, applies game theory to the conflict between hackers and security defenders in suggesting system security can be improved by making it difficult for attackers to figure out how their mark works. For example, adding a layer of obfuscation to a software application can make it harder to reverse engineer.

Pavlovic compares security to a game in which each side has incomplete information. Far from being powerless against attacks, a defender ought to be able to gain an advantage (or at least level the playing field) by examining an attacker's behaviour and algorithms while disguising defensive moves. At the same time defenders can benefit by giving away as few clues about their defensive posture as possible, an approach that the security by obscurity principle might suggest is futile.

Public key encryption works on the basis that making the algorithm used to derive a code secret is useless and codes, to be secure, need to be complex enough so that they can't be unpicked using a brute force attack. As computer power increases we therefore need to increase the length of an encryption key in order outstrip the computational power an attacker might have at his disposal. This still hold true for cryptography, as Pavlovic acknowledges, but may not be case in other scenarios.

Pavlovic argues that an attacker's logic or programming capabilities, as well as the computing resources at their disposal, might also be limited, suggesting that potential shortcomings in this area can be turned to the advantage of system defenders.

The paper, which is likely to spawn a lively debate, Gaming security by obscurity, can be found here. ®

Secure remote control for conventional and virtual desktops

More from The Register

next story
Regin: The super-spyware the security industry has been silent about
NSA fingered as likely source of complex malware family
Why did it take antivirus giants YEARS to drill into super-scary Regin? Symantec responds...
FYI this isn't just going to target Windows, Linux and OS X fans
Privacy bods offer GOV SPY VICTIMS a FREE SPYWARE SNIFFER
Looks for gov malware that evades most antivirus
Home Office: Fancy flogging us some SECRET SPY GEAR?
If you do, tell NOBODY what it's for or how it works
HACKERS can DELETE SURVEILLANCE DVRS remotely – report
Hikvision devices wide open to hacking, claim securobods
'Regin': The 'New Stuxnet' spook-grade SOFTWARE WEAPON described
'A degree of technical competence rarely seen'
Syrian Electronic Army in news site 'hack' POP-UP MAYHEM
Gigya redirect exploit blamed for pop-rageous ploy
Astro-boffins start opening universe simulation data
Got a supercomputer? Want to simulate a universe? Here you go
prev story

Whitepapers

10 ways wire data helps conquer IT complexity
IT teams can automatically detect problems across the IT environment, spot data theft, select unique pieces of transaction payloads to send to a data source, and more.
A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
How to determine if cloud backup is right for your servers
Two key factors, technical feasibility and TCO economics, that backup and IT operations managers should consider when assessing cloud backup.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Choosing a cloud hosting partner with confidence
Download Choosing a Cloud Hosting Provider with Confidence to learn more about cloud computing - the new opportunities and new security challenges.